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given EF||CD
to prove, AB||CD
angle,FEC+ECD=180°(by e angle)
165°+ECD=180°
ECD=180-165
ECD=15°
now,
Angle BCD=15+25=40°
angle ABC=40°
angle ECD=40°
so,AB||CD proved....
to prove, AB||CD
angle,FEC+ECD=180°(by e angle)
165°+ECD=180°
ECD=180-165
ECD=15°
now,
Angle BCD=15+25=40°
angle ABC=40°
angle ECD=40°
so,AB||CD proved....
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